Fastener



FIG. 1 is a perspective view of a fastener showing my new design.

FIG. 2 is a front elevational view thereof.

FIG. 3 is a top-down view thereof.

FIG. 4 is a bottom-up view thereof; and,

FIG. 5 is a side profile view thereof. 

CLAIM The ornamental design for a fastener, as shown and described. 